KR20050031683A - Write-once disc and method of using the write-once disc - Google Patents

Abstract

A write-once disk and a method of using the write-once disk are provided to use efficiently data areas of the write-once disk by expanding or reducing a spare area within a predetermined range according to the size of a temporary disk management area. A method of using a write-once disk comprises a step(11) of allocating and a step(13) of dividing wherein the write-once disk includes a single writing layer in which user data is written in a direction from an inner circumference to an outer circumference. In the step of allocating, a data area from a predetermined position to an end position in the writing layer is allocated to a spare area. In the step of dividing, the spare area is divided into a sub-spare area and a temporal disk management area according to a direction from the inner circumference to the outer circumference. A size of the temporal disk management area is equal to or greater than 1/N(N is real number) of a size of the spare area.

Description

Write-once disc and method of using the write-once disc}

The present invention relates to a write once disc, and more particularly, to a write once disc and a method of using the disc.

Since a write-once disc is an information storage medium capable of recording only once in the data recording area, the user cannot delete or change the recorded information once recording the information on the recording disc once.

In order to record file system information including information related to defect management or various information on data recorded on the disk in consideration of the characteristics of the recording disk, which can be written once, a spare area may be written on the recording disk. A spare area and a temporary disc management area (TDMA) are separately provided.

Defect management refers to preventing data loss due to a defect by recording user data recorded in a defective area again in a spare area when a defect occurs in user data recorded in a user data area of an information storage medium.

Once the defect management method is described in more detail in the recording disk, the drive writes data to the recording disk once in a predetermined unit according to the verify after write method, and then, once the defect has occurred by verifying the recorded data. Find the location on the recording disc. The drive writes the data recorded at the fault location back to the spare area, and records temporary fault information (TDFL) and its temporary fault information indicating the location of the fault and the location of the newly replaced spare area. Create a temporary defect management information (TDDS) indicating the location of the information.

The drive stores the generated temporary defect information or the temporary defect management information in a memory, collects a predetermined amount, and writes them in a temporary disk management area (hereinafter referred to as a TDMA area) provided on the recording disk once. As data is continuously recorded on the recording disk once, the temporary defect information or the temporary defect management information recorded in the TDMA is updated.

In addition, as data is recorded in the spare area, updated file system information reflecting the data may be recorded by using the above-described defect management and logical overwrite functions. The logical write update function is a function of updating information recorded at the same logical address by changing the physical address on the disk corresponding to the logical address without changing the logical recording position of the disk, that is, the logical address. Say.

 In more detail, once the updating process of the file system information on the recording disk is described, whether or not data is recorded in the physical address of the recording disk once corresponds to the logical address of the file system information by the host's file system update command. Check. If the data is identified as an area where data is already recorded, the physical address area is regarded as a defect and the updated file system information is replaced in the spare area and recorded.

The spare area described above is allocated in the data area at the time of initializing the recording disk. At least one TDMA area is provided in an area other than the data area, that is, the lead-in area or the lead-out area. However, at the time of initializing the recording disk, a part of the spare area may be allocated back to the TDMA area.

In addition, the spare area can be expanded when there is more data to be recorded in the spare area than originally expected. However, there is a certain correlation between the information recorded in the spare area and the information recorded in the TDMA area. In other words, if there is a lot of data to be recorded in the spare area, there is a proportional relationship with the data to be recorded in the TDMA area. Therefore, expanding or reducing only the spare area irrespective of the size of the TDMA area has a problem in terms of efficient use of a recording disk once.

Accordingly, the present invention has been made in an effort to provide a write once disc and a method of using the disc, which can more efficiently use the data area of the disc.

In order to achieve the above object, a method of using a write-once disc according to an aspect of the present invention,

A method of using a single recording layer recording medium in which user data is recorded from an inner circumference to an outer circumferential direction, the method comprising: allocating an area from a predetermined position to a last position of a data area included in the recording layer as a spare area; And dividing the spare area into a sub spare area and a temporary disk management area from an inner circumference to an outer circumferential direction, wherein the size of the temporary disk management area is equal to or larger than 1 / N (N is a real number) of the spare area. It features.

In order to achieve the above object, the use method of the write once disc according to another aspect of the present invention,

A method of using a dual recording layer recording medium comprising a first recording layer and a second recording layer, wherein user data is recorded from the first recording layer according to an OTP (Opposite Track Path) method. Allocating an area from the predetermined position to the last position of the included data area as a spare area; And dividing the spare area into a sub spare area and a temporary disk management area from an outer circumference to an inner circumferential direction, wherein the size of the temporary disk management area is equal to or larger than 1 / N of the size of the spare area (N is a real number). It features.

In order to achieve the above object, the recording disc once according to an aspect of the present invention,

A single recording layer in which user data is recorded from the inner circumference to the outer circumferential direction, wherein the recording layer is provided with a data area, and an area from a predetermined position to the last position of the data area is allocated as a spare area, and the spare area Includes a sub spare area and a temporary disk management area from the inner circumference to the outer circumferential direction, and the size of the temporary disk management area is equal to or larger than 1 / N of the size of the spare area (N is a real number).

In order to achieve the above object, the write once disc according to another aspect of the present invention,

10. A dual recording layer once recording disc comprising a first recording layer and a second recording layer, wherein user data is recorded from the first recording layer according to an OTP (Opposite Track Path) method, wherein the second recording layer includes a data area. And an area from a predetermined position to a last position of the data area is allocated as a spare area, wherein the spare area includes a sub spare area and a temporary disk management area from an outer circumference to an inner circumferential direction, and the size of the temporary disk management area is It is characterized in that 1 / N (N is a real number) of the size of the spare area.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, when a spare area is allocated to a data area at the time of initializing a recording disk, and the spare area is further divided into a sub spare area and a TDMA area, the sub spare area is defined in a predetermined range in relation to the size of the TDMA area. By expanding or contracting within the data, the data area or spare area of the recording disk can be used more efficiently.

1 is a diagram showing the structure of a write once disc according to a preferred embodiment of the present invention, in which FIG. 1 (a) shows a single record layer once record disc and FIG. 1 (b) shows a double record layer write once disc. .

Referring to FIG. 1A, the inner area 0, the data area 0, and the outer area 0 are disposed in the circumferential direction from the inner circumference. Data area 0 includes spare area 1, user data area 1, and spare area 2. Referring to Fig. 1B, the double recording layer recording disc once includes recording layers L0 and L1, and the structure of the recording layer L0 is the same as that shown in Fig. 1A. The structure of the recording layer L1 is also the same as that of the recording layer L0.

Fig. 2 is a diagram showing the structure of a recording layer L0 of a single recording layer write once disc or a first recording layer L0 of a double write layer write once disc. Referring to Fig. 2, inner area 0 includes DMA1, a recording condition test area, TDMA1, and DMA1. Data area 0 includes spare area 1, user data area 1, and spare area 2. Spare area 2 is further divided into sub spare area 2 and TDMA 2. Spare areas 1 and 2 are allocated to predetermined positions in the data area according to user selection or drive command at the time of initializing the recording disc. Spare area 2 is further subdivided into sub spare area 2 and TDMA 2 according to user selection or drive command.

The TDMA area is an area for recording information on defect management, information for temporary disk management, and the like. The information on defect management includes the above-mentioned temporary defect information (TDFL) and temporary defect management information (TDDS), and the information for temporary disk management is a space in which the data recording state of a recording disk is written using different bit values once. A space bit map (SBM) or a last recorded address (LRA) of the user data area is included.

The disc management area (DMA) area is an area for recording defect information and temporary disc management information of the last disc recorded in the TDMA area at the time of finalizing the recording disc.

3 is a diagram showing a single recording layer once recording disc in which a spare area and a TDMA area are allocated to a data area according to the present invention. 3 (a) shows a case where spare areas 1 and 2 are allocated to a data area when the recording disk is initialized once. The use direction of the remaining area except the spare area in the data area, that is, the user data area is from the inner circumference to the outer circumference as shown. The use direction of the spare area 1 is similarly circumferential from the inner circumference, but the use direction of the spare area 2 is in the opposite direction from the outer circumference. If the spare area needs to be expanded, spare area 2 is used from the outer circumference to the inner circumferential direction to facilitate the expansion.

In general, the spare area for replacement in the event of a defect allocates approximately 5% of the total capacity of the recording disc once. However, when recording updated file system information in the spare area using Logical Over-Write (hereinafter referred to as LOW) and defect management, the size of the spare area needs to be larger. In the present invention, the spare area is allocated in advance at the time of initialization, and then the spare area is expanded within a predetermined range as necessary during use.

3B illustrates a case in which spare areas 1 and 2 are allocated to the data area, and then spare area 2 is further divided into sub spare area 2 and TDMA 2. FIG.

4 is a diagram showing an example of allocating a spare area and a TDMA area to a data area of a recording layer L0 of a single recording layer once recording disc according to the present invention. This embodiment is a case where the ratio of the size of the first allocated spare area 2 and the size of the TDMA 2 reassigned inside the spare area 2 is 4: 1. Of course, the present invention is not limited thereto, and the ratio of the size of the spare area 2 to the size of the TDMA 2 may be variously changed.

Referring to Fig. 4A, spare area 2 having a size of 4N is allocated at the rear of the data area at the time of initializing the recording disk. The size of an area indicates the number of ECC (Error Correction Code) blocks recorded in the area or the capacity of data that can be recorded in the area. In this embodiment, the size of a specific area is assumed to indicate the number of ECC blocks recorded in that area. 4L represents the maximum size allocable for spare area 2.

4B illustrates a case in which spare area 2 is divided into sub spare area 2 and TDMA 2 again. The use direction of the user data area 0 is the circumferential direction in the inner circumference as shown, and the use direction of the sub spare area 2 is the circumferential direction in the outer circumference to facilitate the expansion of the sub spare area 2.

As described above, since there is a proportional relationship between the amount of data recorded in the spare area and the data to be recorded in the TDMA area, the size of the spare area and the size of the TDMA area are preferably determined in association with each other. In the embodiment shown in FIG. 4B, the size of TDMA 2 is K and has a size of N or more and L or less. That is, it is at least 1/4 of the size of spare area 2 and at most 1/4 of the maximum size that can be allocated for spare area 2. Since the size of TDMA 2 is K, the size of sub spare area 2 is naturally 4N-K.

After spare area 2 is divided into sub spare area 2 and TDMA 2, the size of TDMA 2 cannot be changed. However, the sub spare area 2 can be expanded in the inner circumferential direction or reduced in the outer circumferential direction if necessary. The sub spare area 2 can be expanded in the case where no data is recorded in the area of the user data area 0 in contact with the sub spare area 2.

According to this embodiment, the sub spare area 2 is expanded in consideration of the size of TDMA 2. That is, the sub spare area 2 is expanded in a range in which the size of the extended sub spare area 2 plus the size of the TDMA 2 is not more than four times the size of the TDMA 2. If the size of TDMA 2 is N that is 1/4 of the size of spare area 2, sub spare area 2 cannot be expanded.

 If the amount of data to be recorded in the spare area is small, but the user data area needs to be expanded, the sub spare area 2 may be reduced. The size of the sub spare area 2 can be reduced to "0".

5 is a diagram illustrating an example of allocating a spare area and a TDMA area to a data area of a second recording layer L1 of a double recording layer once recording disc according to the present invention. In the case of a double recording layer recording disc, the spare area allocates spare areas 1 and 2 to the first recording layer L0 and spare areas 3 and 4 to the second recording layer L1, as shown in Fig. 1B. Can be assigned. Of these, the spare area 4 is preferably divided into a sub spare area and a TDMA area. It is possible to expand or reduce all spare areas during the use of the recording disc once. However, since spare area 4 has the easiest area expansion, the spare area 4 is divided into sub spare area 4 and TDMA 2 in this embodiment. Like the single recording layer shown in FIG. 4, the present embodiment will be described with an example in which the ratio of the size of the first allocated spare area 4 and the size of TDMA 2 reassigned inside the spare area 4 is 4: 1. .

The range of the size of the TDMA area allocated within the spare area and the range of expansion or reduction of the sub spare area are the same as those of the embodiment shown in FIG. However, as shown in (b) of FIG. 5, the spare area 4 is divided into sub spare areas 4 and TDMA 2, and the use direction of the user data area 1 is from the outer circumference to the inner circumference, and the use direction of the sub spare area 4 is There is a difference in the opposite direction from the inner circumference to the outer circumference.

6 shows an example of a flowchart of a method of using a single recording layer write once disc according to the present invention.

As shown in Fig. 3A, a single recording layer is allocated as a spare area from the predetermined position to the last position of the data area included in the recording layer of the recording disk once (step 11). The allocation of the spare area is performed at the time of initializing the disk.

 The spare area is divided into a sub spare area and a temporary disk management area (TDMA) from the inner circumference to the circumferential direction (step 13). When the user data is recorded in the data area from the inner circumference to the outer circumferential direction, it is easy to expand or decrease the sub spare area so that the outer circumferential side boundary of the user data area is in contact with the spare area, so that the spare from the inner circumference to the circumferential direction is easy. The area is divided into a sub spare area and a temporary disk management area (TDMA). In the thirteenth step, the size of the TDMA region is preferably equal to or larger than 1 / N (N is a real number) of the spare region. In addition, the size of the TDMA region is preferably 1 / N or less of the maximum size allocable for the spare region. According to an embodiment of the present invention, N is preferably 4.

In the initialization of the recording disc once, the eleventh and thirteenth steps are performed. After the initialization of the disk, as user data is recorded on the recording disk once, data is recorded in at least one spare area and at least one TDMA area provided in the recording disk once.

If the pre-allocated spare area is almost exhausted during the use of the recording disc once, and the spare area needs to be expanded, the sub spare area allocated in step 13 may be extended in the circumferential direction to a size not larger than N times the size of the TDMA area; If the user data area is exhausted and needs to be expanded, the sub spare area is reduced (step 15).

Although not shown in the drawing, even in the case of a double recording layer recording disc, the spare area 4 provided in the second recording layer L1 is divided into the TDMA area 2 and the sub spare area 4 as shown in FIG. Sub spare area 4 can be expanded or contracted within.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, in a write-once disk to which a spare area and a temporary disk management area (TDMA) are allocated, the spare area is expanded or reduced in a predetermined range more efficiently once in association with the size of the temporary disk management area. The data area of the recording disc can be used.

1 is a view showing the structure of a write once disc according to a preferred embodiment of the present invention;

FIG. 2 is a diagram showing the structure of a recording layer of a single recording layer write once disc or a first recording layer of a double recording layer write once disc;

3 is a diagram showing a single recording layer once recording disc in which a spare area and a TDMA area are allocated to a data area according to the present invention;

4 is a view showing an example of allocating a spare area and a TDMA area to a data area of a recording layer of a single recording layer once recording disc according to the present invention;

5 is a diagram illustrating an example of allocating a spare area and a TDMA area to a data area of a second recording layer of a double recording layer once recording disc according to the present invention;

6 shows an example of a flowchart of a method of using a single recording layer write once disc according to the present invention.

Claims (22)

In the method of using a single recording layer once recording disc in which user data is recorded from the inner circumference to the circumferential direction, Allocating an area from a predetermined position to a last position of a data area included in the recording layer as a spare area; And Dividing the spare area into a sub spare area and a temporary disk management area from an inner circumference to an circumferential direction; And the size of the temporary disk management area is equal to or larger than 1 / N of the size of the spare area (where N is a real number). According to claim 1, And the temporary disk management area has a size equal to or less than 1 / N of the maximum size allocable for the spare area. According to claim 1, And extending the sub spare area in an inner circumferential direction to a size equal to or less than N times the size of the temporary disk management area. According to claim 1, And reducing the sub spare area in the circumferential direction. 1. A method of using a dual recording layer once recording disc comprising a first recording layer and a second recording layer, wherein user data is recorded from the first recording layer according to an OTP (Opposite Track Path) method. Allocating an area from a predetermined position to a last position of a data area included in the second recording layer as a spare area; And Dividing the spare area into a sub spare area and a temporary disk management area from an outer circumference to an inner circumferential direction; And the size of the temporary disk management area is equal to or larger than 1 / N of the size of the spare area (where N is a real number). The method of claim 5, And the temporary disk management area has a size equal to or less than 1 / N of the maximum size allocable for the spare area. The method of claim 5, And extending the sub spare area in an circumferential direction to a size equal to or less than N times the size of the temporary disk management area. The method of claim 5, And reducing the sub spare area in an inner circumferential direction. The method according to claim 1 or 5, And the spare area is an area for rewriting the user data or recording updated file system information when a defect occurs in the user data recorded in the user data area. The method according to claim 1 or 5, And the temporary disk management area is an area for recording at least information on temporary defect management. The method according to claim 1 or 5, And N is 4. In a single recording layer once recording disc in which user data is recorded from the inner circumference to the circumferential direction, A data area is provided in the recording layer, an area from a predetermined position to the last position of the data area is allocated as a spare area, the spare area includes a sub spare area and a temporary disc management area from an inner circumference to an outer circumferential direction, And the temporary disk management area has a size equal to or greater than 1 / N (N is a real number) of the spare area. The method of claim 12, And the temporary disk management area has a size equal to or less than 1 / N of the maximum size allocable for the spare area. The method of claim 12, And the sub spare area is an area that can extend in an inner circumferential direction to a size equal to or less than N times the size of the temporary disk management area. The method of claim 12, And the sub spare area is an area that can be reduced in the circumferential direction. In a dual recording layer once recording disc comprising a first recording layer and a second recording layer, wherein user data is recorded from the first recording layer according to an OTP (Opposite Track Path) method. A data area is provided in the second recording layer, and an area from a predetermined position to the last position of the data area is allocated as a spare area, and the spare area includes a sub spare area and a temporary disk management area from an outer circumference to an inner circumferential direction; , And the temporary disk management area has a size equal to or greater than 1 / N (N is a real number) of the spare area. The method of claim 16, And the temporary disk management area has a size equal to or less than 1 / N of the maximum size allocable for the spare area. The method of claim 16, And the sub spare area is an area that can extend in an outer circumferential direction to a size equal to or less than N times the size of the temporary disk management area. The method of claim 16, And the sub spare area is an area that can be reduced in the circumferential direction. The method according to claim 12 or 16, And the spare area is an area for rewriting the user data or recording updated file system information when a defect occurs in the user data recorded in the user data area. The method according to claim 12 or 16, And the temporary disk management area is an area for recording at least information on temporary defect management. The method according to claim 12 or 16, And N is four.